First time: I got hit on by another man at the gym

Wow. First time ever in a non-sexual environment. I have been with a lot of guys before, years ago (I am 44), but those were in highly sexualized, no bullshit environments (adult bookstores, mostly). Tonight, I got hit on by a guy in the lockerroom at my gym (not a particularly gay gym, either). He was very subtle, friendly, nothing explicit, but I could tell he was interested. My assumption is that he saw my pierced nipples as a sign (reasonable enough) and that even if I weren’t gay I would be unlikely to freak (true enough…guys with pierced nipples, and the backbone to not hide them in a lockerroom, probably aren’t generally fazed by sexual matters). He was decent looking too, 50s and in good shape if a little heavy (hey, welcome to 50) with a nice cock. Truth be told, his body looked a little like mine with much less hair.

This never happens to me…so I thought. I wonder: am I blind? Has this happened before, only now I recognized it? I have always been blind to flirting with women, have I missed flirting guys, too?